Re: Looking for advice on fixed bridge RGs
RG521 Genesis used can be found used in your price range. Fits all of your requirements and since it's practically new it should be easy to find one in mint condition for $700-$800. Also has the tilt joint which some think has slightly better tone than the aanj. Tilt Joint and fixed bridge are like bread and butter. Could use a pickup swap, but it isn't really necessary.
If you're thinking about any other guitar besides this then stop.
Some food for thought,
Ibanez RG Super Wizard necks are kind of love it or hate it. I find switching from those to other necks takes some adjustment. I have a RG6UCS and it is badass, but I also have a JS1600 as my fixed bridge guitar of choice and it has a Fender shaped neck. Switching between the two takes some adjustment. I kind of feel like I'm hurting my ability to develop great muscle memory by switching from one guitar to another that have such different shapes. My JS1600 sounds so good I thought about getting rid of the RG6UCS and getting a trem bridge JS
Either way, if I decide to stay RG/Super Wizard the RG521 Genesis is my choice.